1291115 has 16 divisors (see below), whose sum is σ = 1820352. Its totient is φ = 860544.

The previous prime is 1291111. The next prime is 1291117. The reversal of 1291115 is 5111921.

1291115 = T₁₅₆ + T₁₅₇ + ... + T₂₂₅.

It is a cyclic number.

It is not a de Polignac number, because 1291115 - 2² = 1291111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 797 + ... + 1793.

It is an arithmetic number, because the mean of its divisors is an integer number (113772).

2^1291115 is an apocalyptic number.

1291115 is a deficient number, since it is larger than the sum of its proper divisors (529237).

1291115 is an equidigital number, since it uses as much as digits as its factorization.

1291115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046.

The product of its digits is 90, while the sum is 20.

The square root of 1291115 is about 1136.2724145204. The cubic root of 1291115 is about 108.8900780023.

The spelling of 1291115 in words is "one million, two hundred ninety-one thousand, one hundred fifteen".